(344*2+212):9=(688+212):9=900:9=100
640:(564-406-150)=640:8=80
2*(150*2+105:5)=2*(300+21)=2*321=642
(281+127-298:2)*2=(281+127-149)*2=259*2=518
(344*2+212):9=(688+212):9=900:9=100
640:(564-406-150)=640:8=80
2*(150*2+105:5)=2*(300+21)=2*321=642
(281+127-298:2)*2=(281+127-149)*2=259*2=518